Grinding device.



R. W. COON.

GRINDING DEVICE.

APPLICATION man m 3. 1915.

Patented Dec. 14, 1915.

fizyn WITNESSES ATTORNEYS I;

@T a Y a 1 re.

RALP w. coon, or noueiaroiv, MICHIGAN.

. Gninnfive Dav es.

Application flled May 3, 1915. Serial No. 25,652.

To all whom it may concern:

Be it known that I, RALPH W. CooN, a citizen of the United States, residing at Houghton, in the county of Houghton and State of Michigan, have invented certain new and useful Improvements in Grinding Devices, of which the following is a specification.

This invention relates to a grinding device which is especially adapted for grinding the cutting edges of scissors or the like.

The primary object of the invention is to produce a device of this character of cheap and simple construction, yet eflicient in carrying out its intended use.

Another object of the invention is to produce a grinding device embodying an improved construction of adjusting means for controlling the angular adjustment of the instrument to be sharpened relatively to the face of the grinding medium.

With these and minor objects in view, the invention resides in a construction embodying certain novel details which will be hereinafter fully described with reference to the accompanying drawing, and more particularly pointed out in the subjoined claims.

In said drawing Figure 1 is a perspective view of the device showing a pair of scissors applied in position to be sharpened. Fig. 2 is a side elevation of the device with the scissors removed.

Referring to the drawing in detail, the de vice embodies a suitable base a which, in order that it may properly support the mechanism is preferably of oblong shape and constructed of some suitable solid material. Mounted on the base a is a suitable grinding medium I) such as an oil stone or the like. This o-il stone is also preferably made oblong and mounted on the base 3 in a convenient position, preferably at one end thereof.

In order that the oil stone may be securely mounted on the base, it is provided with undercut portions 15 at each end, which are adapted to engage suitable chucks b fixed on the base. Also mounted on the base a is a block 0 which is adapted to support a screw-eye, or the like, (Z. This block 0 is preferably located on the opposite end of the base a to that which supports the grinding medium. It is also preferably of athicker dimension than the grinding medium. Slidably supported over the grinding medium I) is a subdivided block 6, the

two halves of which are joined together at their tops by means of a hinge g, and at their bottoms by a spacing clamp it, having a thumbscrew z. Mounted to the part f of the block 6 is a clamping member j which is adapted to receive the instrument to be ground, and firmly clamp it between its two opposed hinged clamping faces by means of the thumb screw In. In order to present the edge of the instrument in proper grinding relation to the grinding medium, the part 7' of the block 6 is provided with a beveled face on which the clamping member is mounted. This enables the clamping member to present the edge of the instrument at an angle to the grinding medium.

Mounted to the block 6 is a guide rod Z, which rod extends from the block longitudinal of the base a, and engages in the screweye cl, and in which it is adapted to be slidably supported.

With the instrument to be ground clamped to the clamping member j, as shown in Fig. 1, the block 6 may be reciprocated back and forth with freedom to oscillate as well, whereby the edge of the instrument will be caused to traverse the grinding. medium, and thereby sharpened.

Toobtain different angular adjustment of the edge of the instrument relative to the grinding medium, the two parts of the sub divided block 6 are spaced apart according to the angle desired. In spacing the parts, the thumb-screw i is loosened, and the parts spread apart until the adjustment is obtained, and then the thumb screw is again tightened.

As heretofore stated, the instrument will be so supported during its sharpening oper ation that the operator may not only reciprocate it back and forth, but with the loose engagement of the guide rod e with the screw-eye (Z, the instrument may, if desired, be readily oscillated across the face of the grinding medium.

Claims:

1. A grinding device, comprising a base, a grinding medium mounted on said base, means supported over said grinding me dium adapted to support an instrument with freedom of movement in grinding re lation to said medium, said means comprising a member constructed of two parts, an instrument clamp carried by one of said parts, and a guide member carried by the other of said parts, a spacing clamp connecting said parts and adapted to control the grinding adjustment of the instrument relative to the grinding' medium.

2. A grinding device comprising a base, a grinding medium mounted on one endof said base, and a pivot bearing mounted onthe other end of'sa-id base, a subdivided block supported With freedom of movement over said grinding medium, said subdivided block comprising tWo parts lunged together attheir top, a guide rod mounted on one of said parts and engaging said pivot bearing, an instrument clamp mounted on the other of said partsya spacing clamp connecting bothof said parts adapted to space them one from the other to adjust the angle of the instrument with relation to the grinding medium.

The foregoing specification signed at Houghton Michigan this 15th day of April, 20 1915.

RALPH \V. COON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washing-tomD. G. 

